Advisor / ISO GPS reference / Perpendicularity
Orientation tolerance · ISO 1101
Perpendicularity
Limits how far a feature may deviate from a right angle to a datum.
In the shop
A face machined in the same clamping as the datum holds perpendicularity best. Side milling with a long tool leans with deflection, so finish with a light radial cut.
General shop guidance in our own words. The drawing and the standard it cites decide; verify on a sample part.
Related orientation tolerances
Ask about your drawing
Tell the advisor the feature, the tolerance on the drawing and the material. It answers with machining choices, brand-neutral.
Sources
Definition written in our own words and checked against keyence.com. Symbol and term names follow ISO 1101; we do not reproduce standard text. See the full index.